Ricoh FT4430 Service Manual page 220

7. Place a few of A3 (11" x 17") paper on the exposure glass.
8. Enter "56" using the numeral keys, then press the Enter key.
9. Enter "99" using the numeral keys ,then press the Start key .
10. Adjust the Auto ID sensor by turning VR2 on the lamp regulator board.
NOTE: - Continue the adjustment procedure until the value is within
specifications.
- When adjusting the Auto ID sensor, use the monitor reading after
the 3rd scanning operation.
11. Turn off the main switch and the DIP switches, then reassemble.
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16 April '88